Need help with replacing 2 gang dimmer switch please

as long as switch the power off at the mains everytime I do the works, will testing different wires in different terminals do any further damage?
It's not trial and error as such.
It's changing the switches to operate the other light.

It's not rocket surgery.

upload_2019-12-31_15-21-21.png
 
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It's not trial and error as such.
It's changing the switches to operate the other light.

It's not rocket surgery.

View attachment 179855
sorry to be dumb but just to confirm, I simply remove the extra earth wire and connect as per previous (old L1>new L2 and old C>new L1). connect the random loose black wire to an empty connector block.

as per this new dioagram?
 

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Your diagram is correct ,but your description is not. ( old L1 is new L1 ,is not correct )
 
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